JP5638513B2 - Indolizine derivatives and their pharmaceutical use - Google Patents

Description

  The present invention relates to an indolizine derivative useful as a pharmaceutical product.

  More specifically, the present invention has an xanthine oxidase inhibitory activity and is useful as a preventive or therapeutic agent for diseases caused by abnormal serum uric acid levels, or an indolizine derivative or a prodrug thereof, or a pharmacologically acceptable salt thereof. Relating to salt.

  Uric acid is the end product of purine metabolism in humans. In many mammals, unlike humans, uric acid is further decomposed into allantoin by the urate oxidase (uricase) in the liver and excreted from the kidney. The main route of uric acid excretion in humans is the kidney, about 2/3 is excreted in the urine and the rest is excreted from the stool. Hyperuricemia occurs due to excessive uric acid production or decreased uric acid excretion. Hyperuricemia is classified into an excessive uric acid production type, a reduced uric acid excretion type, and a mixed type thereof. This classification of hyperuricemia is clinically important, and therapeutic drugs in each classification are selected in consideration of reducing the side effects of the therapeutic drugs (see, for example, Non-Patent Document 1).

  In uric acid-producing hyperuricemia, urinary uric acid excretion is increased, and if urinary uric acid excretion is further increased by the use of a uric acid excretion-promoting drug, urinary calculi may be combined. Therefore, in principle, allopurinol, which is a uric acid production inhibitor (or uric acid synthesis inhibitor, hereinafter referred to as “uric acid production inhibitor”), is used for the uric acid production excessive type.

  Uric acid is finally produced from xenotin oxidized by xanthine oxidase from diet-derived and endogenously produced purines. Allopurinol is the only uric acid production inhibitor developed as a xanthine oxidase inhibitor and used in the medical field. However, allopurinol has been reported to be effective against hyperuricemia and various diseases resulting from it, but on the other hand, poisoning syndrome (hypersensitivity vasculitis), Stevens-Johnson syndrome, exfoliative dermatitis, aplasticity Serious side effects such as anemia and liver dysfunction have also been reported (for example, see Non-Patent Document 2). As one of the causes, it has been pointed out that allopurinol has a nucleic acid-like structure and inhibits the pyrimidine metabolic pathway (see, for example, Non-Patent Document 3).

  On the other hand, in uric acid excretion-type hyperuricemia, the excretion of uric acid is decreased, and when allopurinol, which is metabolized by oxypurinol excreted from the kidney by the same mechanism as uric acid, is used, the excretion of oxypurinol is also reduced. It has been reported that the frequency of liver damage increases and the frequency of liver damage increases (see, for example, Non-Patent Document 4). Therefore, in principle, uric acid excretion promoting agents such as probenecid and benzbromarone are used for the urate excretion-reducing type. However, these uric acid excretion promoting agents also exhibit side effects such as gastrointestinal disorders and urinary calculi. In particular, benzbromarone is known to cause fulminant hepatitis in patients with idiosyncratic constitution (see, for example, Non-Patent Documents 5 and 6).

  As described above, it is said that both existing uric acid production inhibitors and uric acid excretion promoters have limitations on use and severe side effects on patients, and development of easy-to-use therapeutic agents such as hyperuricemia is eagerly desired.

  Uric acid is mainly excreted from the kidney, but the dynamics of uric acid in the kidney have been studied by experiments using brush border membrane vesicles (BBMV) prepared from the renal cortex (for example, Non-Patent Document 7 and 8). It has been clarified that uric acid freely passes through the glomeruli in humans in humans, and there is a mechanism of reabsorption and secretion of uric acid in the proximal tubule (see, for example, Non-Patent Document 9).

  In recent years, a gene (SLC22A12) encoding a human renal urate transporter has been identified (see, for example, Non-Patent Document 10). A transporter (urate transporter 1, hereinafter referred to as “URAT1”) encoded by this gene is a 12-transmembrane molecule belonging to the OAT family. URAT1 specifically expressed mRNA in the kidney, and was further localized on the proximal tubular lumen side in human kidney tissue sections. Experiments with the Xenopus oocyte expression system showed uric acid uptake via URAT1. Furthermore, its uptake of uric acid is transported by exchange with organic anions such as lactic acid, pyrazinecarboxylic acid (PZA), nicotinic acid, and urate uptake through URAT1 is inhibited by probenecid and benzbromarone, which are uric acid excretion promoters. It became clear that. Therefore, it was strongly suggested to be an urate / anion exchanger, which was expected by experiments using membrane vesicles. That is, it was revealed that URAT1 is a transporter that plays an important role in uric acid reabsorption in the kidney (see, for example, Non-Patent Document 10).

  In addition, the relationship between URAT1 and diseases has also been clarified. Idiopathic renal hypouricemia is a disease in which uric acid excretion is increased due to abnormal uric acid dynamics in the kidney and serum uric acid level is low. In this disease, it is known that there are many complications of urinary calculi and acute renal failure after exercise. URAT1 was identified as a causative gene of this renal hypouricemia (for example, refer nonpatent literature 10). The above also strongly suggests that URAT1 is involved in the regulation of serum uric acid levels.

  Therefore, a substance having a URAT1 inhibitory activity is a therapeutic and prophylactic agent for diseases involving high serum uric acid levels, that is, hyperuricemia, gouty nodule, gout arthritis, renal disorder due to hyperuricemia, urolithiasis, etc. Useful as a medicine.

  In the treatment of hyperuricemia, it was reported that the combined use of allopurinol, a uric acid production inhibitor, and a drug that promotes excretion of uric acid, showed a stronger decrease in serum uric acid level compared to allopurinol alone. (For example, see Non-Patent Documents 11 and 12). That is, when the effect of the conventional treatment with a single agent is not sufficient, a higher therapeutic effect can be expected by the combined use of a uric acid production inhibitor and a uric acid excretion promoter. In addition, for uric acid excretion-type hyperuricemia, urinary uric acid excretion can be reduced by lowering serum uric acid levels. It is considered to be reduced. Moreover, a high therapeutic effect can be expected for mixed hyperuricemia. As described above, a drug having both a uric acid production inhibitory action and a uric acid excretion promoting action is expected to be a very useful preventive or therapeutic agent for hyperuricemia and the like.

  As a compound having both xanthine oxidase inhibitory action and URAT1 inhibitory action, natural product morin is known (see Non-Patent Document 13).

Benzoic acid or salicylic acid derivatives having xanthine oxidase inhibitory activity are known (see Patent Documents 1 to 5). However, none of the literature describes or suggests the indolizine derivative of the present invention.
International Publication No. WO2007 / 043400 Pamphlet International Publication No. WO2007 / 043401 Pamphlet International Publication No. WO2008 / 126898 Pamphlet International Publication No. WO2008 / 126899 Pamphlet International Publication No. WO2008 / 126901 Pamphlet Tatsuo Taniguchi and one other, Modern Physician, 2004, Vol. 24, No. 8, pp. 1309-1312 Kazuhide Kanno and two others, Japanese Clinical, 2003, Volume 61, Special Number 1, p.197-201 Hideki Horiuchi and 6 others, Life Science, 2000, 66, 21, p.2051-2070 Toru Yamanaka and two others, hyperuricemia and gout, published by Medical Review, 1994, Vol. 2, No. 1, p.103-111 Robert A Terkeltaub, N. Engl. J. Med., 2003, 349, p. 1647-1655 Ming-Han H. Lee and 3 others, Drug Safety, 2008, 31, p.643-665 Francoise Roch-Ramel and two others, Am. J. Physiol., 1994, 266 (Renal Fluid Electrolyte Physiol. 35), F797-F805 Francoise Roch-Ramel and two others, J. Pharmacol. Exp. Ther., 1997, 280, pp. 839-845 Gim Gee Teng and two others, Drugs, 2006, 66, 1547-1563 Atsushi Enomoto and 18 others, Nature, 2002, 417, pp. 447-452 S Takahashi and 5 others, Ann. Rheum. Dis., 2003, 62, 572-575 MDFeher and 4 others, Rheumatology, 2003, 42, pp.321-325 Zhifeng Yu and two others, J. Pharmacol. Exp. Ther., 2006, 316, pp. 169-175

  An object of the present invention is to provide a preventive or therapeutic agent for diseases caused by abnormal serum uric acid levels, which has a uric acid production inhibitory effect.

  As a result of intensive studies to solve the above problems, the present inventors have shown that indolizine derivatives represented by the following formula (I) exhibit excellent xanthine oxidase inhibitory activity and significantly reduce serum uric acid levels. Thus, the present inventors have found that the present invention can be a novel preventive or therapeutic agent for diseases caused by abnormal serum uric acid levels.

〔式中、
環Ｕはアリール又はへテロアリール；
Ｒ^１はハロゲン原子、水酸基、ニトロ、アミノ又はフッ素原子で置換されていてもよいＣ_１−６アルキル；
Ｒ^２は、以下の（１）〜（７）：
（１）ハロゲン原子；
（２）水酸基；
（３）アミノ；
（４）カルバモイル；
（５）シアノ；
（６）カルボキシ；
（７）それぞれ置換基群αから選択される任意の基を有していてもよい以下の基：Ｃ_１−６アルキル、Ｃ_２−６アルケニル、Ｃ_２−６アルキニル、Ｃ_１−６アルコキシ、モノ（ジ）Ｃ_１−６アルキルアミノ、Ｃ_２−７アシル、Ｃ_２−７アシルアミノ、モノ（ジ）Ｃ_１−６アルキルカルバモイル、Ｃ_１−６アルキルスルホニル、Ｃ_１−６アルキルスルホニルアミノ、モノ（ジ）Ｃ_１−６アルキルスルファモイル、Ｃ_１−６アルキルチオ、Ｃ_２−６アルケニルＣ_１−６アルコキシ、Ｃ_３−８シクロアルキル、３〜８員環ヘテロシクロアルキル、Ｃ_５−８シクロアルケニル、５〜８員環ヘテロシクロアルケニル、Ｃ_３−８シクロアルキルオキシ、Ｃ_３−８シクロアルキルアミノ、Ｃ_３−８シクロアルキルＣ_１−６アルキル、Ｃ_３−８シクロアルキルＣ_１−６アルコキシ、Ｃ_３−８シクロアルキルＣ_１−６アルキルアミノ、アリール、ヘテロアリール、アリールオキシ、アリールアミノ、アリールカルボニル、アリールカルボニルアミノ、アリールＣ_１−６アルコキシ、ヘテロアリールオキシ、ヘテロアリールアミノ、ヘテロアリールカルボニル又はヘテロアリールカルボニルアミノ；
の何れかであり；
ｍは０〜２の整数（但し、ｍが２であるとき、これらのＲ^１は互いに異なっていてもよい。）；
ｎは０〜３の整数（但し、ｎが２又は３であるとき、これらのＲ^２は互いに異なっていてもよく；更に、２つのＲ^２が、インドリジン環内の隣り合った原子に結合して存在し、かつ、それぞれ独立して、フッ素原子で置換されていてもよいＣ_１−６アルキル及びフッ素原子で置換されていてもよいＣ_１−６アルコキシから選択される基である場合は、２つのＲ^２が結合するインドリジン環内の原子と共に５〜８員環を形成していてもよい。）；
Ｒ^３は水素原子、塩素原子又はフッ素原子；
置換基群αは、フッ素原子、塩素原子、水酸基、アミノ、カルボキシ、カルバモイル、シアノ、Ｃ_１−６アルキル、Ｃ_１−６アルコキシ及びモノ（ジ）Ｃ_１−６アルキルアミノ；である。〕で表されるインドリジン誘導体もしくはそのプロドラック、又はその薬理学的に許容される塩；That is, the present invention
[1] Formula (I)

[Where,
Ring U is aryl or heteroaryl;
R ¹ is C _1-6 alkyl _optionally substituted with a halogen atom, a hydroxyl group, a nitro, amino or fluorine atom;
R ² is the following (1) to (7):
(1) a halogen atom;
(2) hydroxyl group;
(3) amino;
(4) Carbamoyl;
(5) Cyano;
(6) Carboxy;
(7) The following groups each optionally having an arbitrary group selected from substituent group α: C _1-6 alkyl, C _2-6 alkenyl, C _2-6 alkynyl, C _1-6 alkoxy, Mono (di) C _1-6 alkylamino, C _2-7 acyl, C _2-7 acylamino, mono (di) C _1-6 alkylcarbamoyl, C _1-6 alkylsulfonyl, C _1-6 alkylsulfonylamino, mono (Di) C _1-6 alkylsulfamoyl, C _1-6 alkylthio, C _2-6 alkenyl C _1-6 alkoxy, C _3-8 cycloalkyl, 3-8 membered heterocycloalkyl, C _5-8 cyclo alkenyl, 5-8 membered _{heterocycloalkenyl, C 3-8 cycloalkyloxy, C 3-8 cycloalkylamino, C 3-8} cycloalkyl _{C 1-6 alkyl, C 3-8} A cycloalkyl _{C 1-6 alkoxy, C 3-8 cycloalkyl-C 1-6} alkylamino, aryl, heteroaryl, aryloxy, arylamino, arylcarbonyl, arylcarbonylamino, aryl _{C 1-6} alkoxy, heteroaryloxy, Heteroarylamino, heteroarylcarbonyl or heteroarylcarbonylamino;
One of the following:
m is an integer of 0 to 2 (provided that when m is 2, these R ^{1 s} may be different from each other);
n is an integer from 0 to 3 (provided that when n is 2 or 3, these R ^{2 s} may be different from each other; in addition, two R ² are bonded to adjacent atoms in the indolizine ring. there was, and, independently, optionally be substituted with a fluorine atom substituted at C _1-6 alkyl and fluorine atom are groups also selected from a C _1-6 alkoxy And may form a 5- to 8-membered ring with the atoms in the indolizine ring to which two R ² are bonded.);
R ³ is a hydrogen atom, a chlorine atom or a fluorine atom;
The substituent group α is a fluorine atom, a chlorine atom, a hydroxyl group, amino, carboxy, carbamoyl, cyano, C _1-6 alkyl, C _1-6 alkoxy, and mono (di) C _1-6 alkylamino; Or a prodrug thereof, or a pharmacologically acceptable salt thereof;

〔式中、
環Ｕはアリール又はへテロアリール；
Ｒ^１ａは水素原子、フッ素原子、水酸基、アミノ、メチル又はトリフルオロメチル；
Ｒ^２ａ及びＲ^２ｂは、それぞれ独立して、以下の（ａ１）〜（ａ４）：
（ａ１）水素原子；
（ａ２）ハロゲン原子；
（ａ３）水酸基；
（ａ４）それぞれ置換基群αから選択される任意の基を有していてもよい以下の基：Ｃ_１−６アルキル、Ｃ_１−６アルコキシ、モノ（ジ）Ｃ_１−６アルキルアミノ、Ｃ_２−７アシル、Ｃ_１−６アルキルチオ、Ｃ_３−８シクロアルキル、３〜８員環ヘテロシクロアルキル、アリール又はヘテロアリール；の何れかであり；
Ｒ^２ｃは、水素原子、ハロゲン原子、水酸基、置換基群αから選択される任意の基を有していてもよいＣ_１−６アルキル又は置換基群αから選択される任意の基を有していてもよいＣ_１−６アルコキシ；であるか、又はＲ^2ａ及びＲ^2ｂ、もしくはＲ^2ｂ及びＲ^2ｃがそれぞれ独立して、フッ素原子で置換されていてもよいＣ_１−６アルキル及びフッ素原子で置換されていてもよいＣ_１−６アルコキシから選択される基である場合は、結合するインドリジン環内の原子とともに５〜８員環を形成していてもよい。）；
Ｒ^２ｄは水素原子又はフッ素原子；
Ｒ^３ａは水素原子又はフッ素原子；
置換基群αは前記〔１〕と同じ意味；である。〕で表される、前記〔１〕記載のインドリジン誘導体もしくはそのプロドラック、又はその薬理学的に許容される塩；
〔３〕環Ｕがベンゼン、ピリジン、チオフェン又はチアゾール環である前記〔２〕記載のインドリジン誘導体もしくはそのプロドラック、又はその薬理学的に許容される塩；
〔４〕式

で表される基が、式

で表される基であり、かつ、Ｒ^１ａが水素原子又は水酸基である、前記〔２〕記載のインドリジン誘導体もしくはそのプロドラック、又はその薬理学的に許容される塩；[2] Formula (Ia)

[Where,
Ring U is aryl or heteroaryl;
R ^1a represents a hydrogen atom, a fluorine atom, a hydroxyl group, amino, methyl or trifluoromethyl;
R ^2a and R ^2b are each independently the following (a1) to (a4):
(A1) a hydrogen atom;
(A2) a halogen atom;
(A3) hydroxyl group;
(A4) The following groups optionally having any group selected from substituent group α: C _1-6 alkyl, C _1-6 alkoxy, mono (di) C _1-6 alkylamino, C _2-7 acyl, C _1-6 alkylthio, C _3-8 cycloalkyl, 3-8 membered heterocycloalkyl, aryl or heteroaryl;
R ^2c has a hydrogen atom, a halogen atom, a hydroxyl group, C _1-6 alkyl optionally having an arbitrary group selected from substituent group α, or an arbitrary group selected from substituent group α which may be _{C 1-6} alkoxy; or where R ^2a and R ^2b or R ^2b and R ^2c, are each independently, _{C 1-6} alkyl optionally substituted by a fluorine atom and a fluorine atom In the case of a group selected from C _1-6 alkoxy which may be substituted, a 5- to 8-membered ring may be formed together with the atoms in the indolizine ring to which it is bonded. );
R ^2d is a hydrogen atom or a fluorine atom;
R ^3a represents a hydrogen atom or a fluorine atom;
Substituent group α has the same meaning as [1] above. ] The indolizine derivative of the above-mentioned [1] or a prodrug thereof, or a pharmacologically acceptable salt thereof,
[3] The indolizine derivative or prodrug thereof or the pharmacologically acceptable salt thereof according to the above [2], wherein the ring U is a benzene, pyridine, thiophene or thiazole ring;
[4] Formula

Is a group represented by the formula

An indolizine derivative or a prodrug thereof, or a pharmacologically acceptable salt thereof according to the above [2], wherein R ^1a is a hydrogen atom or a hydroxyl group;

[5] R ^2a and R ^2b are each independently the following (b1) to (b4):
(B1) a hydrogen atom;
(B2) a halogen atom;
(B3) hydroxyl group;
(B4) Either of the following groups each optionally substituted with a fluorine atom: C _1-6 alkyl, C _1-6 alkoxy, mono (di) C _1-6 alkylamino or hydroxy C _1-6 alkyl Is;
R ^2c is a hydrogen atom, a halogen atom, a hydroxyl group, a C _1-6 alkyl which may be substituted with a fluorine atom, or a C _1-6 alkoxy which may be substituted with a fluorine atom;
The indolizine derivative or prodrug thereof according to the above [3] or [4], or a pharmacologically acceptable salt thereof;
[6] The indolizine derivative or prodrug thereof according to any one of the above [2] to [5], wherein R ^2d is a hydrogen atom, or a pharmacologically acceptable salt thereof;
[7] The indolizine derivative or prodrug thereof according to any one of [1] to [6], wherein R ³ or R ^3a is a hydrogen atom, or a pharmacologically acceptable salt thereof;
[8] R ^1a is a hydrogen atom or a hydroxyl group;
R ^2a is a hydrogen atom, a fluorine atom, a chlorine atom, methyl, ethyl, methoxy, monofluoromethyl, difluoromethyl, trifluoromethyl, difluoromethoxy or trifluoromethoxy;
R ^2b is a hydrogen atom, a fluorine atom, a chlorine atom, methyl, ethyl, methoxy, monofluoromethyl, difluoromethyl, trifluoromethyl, difluoromethoxy or trifluoromethoxy;
^R2c is a hydrogen atom, a fluorine atom, a chlorine atom, methyl, monofluoromethyl, difluoromethyl, or trifluoromethyl; the indolizine derivative or prodrug thereof according to [6] or [7], or a pharmacological thereof Acceptable salts;
[9] The indolizine derivative or prodrug thereof according to the above [8], wherein R ^2b is a hydrogen atom, methyl, ethyl, methoxy, monofluoromethyl, difluoromethyl, trifluoromethyl, difluoromethoxy or trifluoromethoxy, or A pharmacologically acceptable salt;
[10] The indolizine derivative according to [8] or [9] above, wherein R ^1a is a hydrogen atom, or a prodrug thereof, or a pharmaceutically acceptable salt thereof;
[11] The indolizine derivative according to the above [8] or [9], wherein R ^1a is a hydroxyl group, or a prodrug thereof, or a pharmaceutically acceptable salt thereof;
[12] The indolizine derivative or prodrug thereof according to any one of [1] to [11], which is a xanthine oxidase inhibitor, or a pharmacologically acceptable salt thereof;
[13] A pharmaceutical composition comprising the indolizine derivative or prodrug thereof according to any one of [1] to [11], or a pharmacologically acceptable salt thereof as an active ingredient;
[14] The pharmaceutical composition of the above-mentioned [13], which is used for prevention or treatment of a disease selected from hyperuricemia, gouty nodule, gout arthritis, renal disorder due to hyperuricemia and urolithiasis;
[15] The pharmaceutical composition according to the above [14], which is used for prevention or treatment of hyperuricemia.
[16] The pharmaceutical composition according to the above [13], which is a serum uric acid level lowering drug;
[17] The pharmaceutical composition according to the above [13], which is a uric acid production inhibitor.

In the indolizine derivative represented by the formula (I) of the present invention, each term has the following meaning.
“Halogen atom” refers to a fluorine atom, a chlorine atom, a bromine atom or an iodine atom.
“C _1-6 alkyl” means a linear or branched alkyl group having 1 to 6 carbon atoms, such as methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl, tert-butyl and the like. It is done.
“C _1-6 alkylene” refers to a divalent group derived from the above C _1-6 alkyl.
“C _2-6 alkenyl” refers to a linear or branched alkenyl group having 2 to 6 carbon atoms, and includes vinyl, allyl, 1-propenyl, isopropenyl and the like.
“C _2-6 alkynyl” refers to a linear or branched alkynyl group having 2 to 6 carbon atoms, and includes ethynyl, 2-propynyl and the like.
“C _1-6 alkoxy” refers to a linear or branched alkoxy group having 1 to 6 carbon atoms, and includes methoxy, ethoxy, propoxy, isopropoxy and the like.
“Hydroxy C _1-6 alkyl” refers to a linear or branched hydroxyalkyl group having 1 to 6 carbon atoms.
“C _1-6 alkylsulfonyl” refers to a group represented by (C _1-6 alkyl) -SO ₂ —, and examples thereof include methylsulfonyl, ethylsulfonyl and the like.
“C _1-6 alkylsulfonylamino” refers to a group represented by (C _1-6 alkyl) -SO ₂ NH—, and examples thereof include methylsulfonylamino, ethylsulfonylamino and the like.
“C _2-7 acyl” refers to a linear or branched acyl group having 2 to 7 carbon atoms, and includes acetyl, propionyl, butyryl, isobutyryl, pivaloyl and the like.
“C _2-7 acylamino” refers to a group represented by (C _1-6 alkyl) -C (O) NH—.
“C _1-6 alkylthio” refers to a group represented by (C _1-6 alkyl) -S—.
“C _2-6 alkenyl C _1-6 alkoxy” refers to the above C _1-6 alkoxy substituted with the above C _2-6 alkenyl.

“Mono (di) C _1-6 alkylamino” refers to an amino mono- or di-substituted with the above C _1-6 alkyl.
“Mono (di) C _1-6 alkylsulfamoyl” refers to sulfamoyl mono- or di-substituted with the above C _1-6 alkyl.
“Mono (di) C _1-6 alkylcarbamoyl” refers to carbamoyl mono- or di-substituted with the above C _1-6 alkyl.
In the case of disubstitution, each substituent may be different from each other.

“C _3-8 cycloalkyl” refers to a 3- to 8-membered saturated cyclic hydrocarbon group, and includes cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, or cyclooctyl.
“C _5-8 cycloalkenyl” refers to a 5- to 8-membered cycloalkenyl group, and examples thereof include cyclopentenyl, cyclohexenyl, cycloheptenyl, cyclooctenyl and the like.
“3- to 8-membered heterocycloalkyl” refers to a 3- to 8-membered heterocycloalkyl group containing 1 to 2 identical or different heteroatoms selected from an oxygen atom, a sulfur atom and a nitrogen atom in the ring. Examples thereof include aziridino, azetidino, morpholino, 2-morpholinyl, thiomorpholino, 1-pyrrolidinyl, piperidino, 4-piperidinyl, 1-piperazinyl, 1-pyrrolyl, tetrahydrofuranyl, tetrahydropyranyl and the like.
“5- to 8-membered heterocycloalkenyl” refers to a 5- to 8-membered heterocycloalkenyl group containing 1 to 2 identical or different heteroatoms selected from an oxygen atom, a sulfur atom and a nitrogen atom in the ring. Examples thereof include dihydrofuranyl, dihydrothiophenyl, dihydropyrrolyl, oxathionyl and the like.
“C _3-8 cycloalkyloxy” refers to a group represented by (C _3-8 cycloalkyl) -O—.
“C _3-8 cycloalkylamino” refers to a group represented by (C _3-8 cycloalkyl) -NH—.
“C _3-8 cycloalkyl C _1-6 alkyl” refers to the above C _1-6 alkyl substituted with the above C _3-8 cycloalkyl.
“C _3-8 cycloalkyl C _1-6 alkoxy” refers to the above C _1-6 alkoxy substituted with the above C _3-8 cycloalkyl.
“C _3-8 cycloalkyl C _1-6 alkylamino” refers to a group represented by (C _1-6 alkyl) -NH— substituted with the above C _3-8 cycloalkyl.

“Aryl” refers to phenyl.
“Aryloxy” refers to a group represented by (aryl) -O—.
“Arylamino” refers to a group represented by (aryl) -NH—.
“Arylcarbonyl” refers to a group represented by (aryl) -C (O) —.
“Arylcarbonylamino” refers to a group represented by (aryl) -C (O) NH—.
“Aryl C _1-6 alkoxy” refers to the above C _1-6 alkoxy substituted with the above aryl.

“Heteroaryl” refers to a 5- or 6-membered aromatic heterocyclic group containing 1 to 4 of the same or different heteroatoms selected from an oxygen atom, a sulfur atom and a nitrogen atom, and is thiazolyl, oxazolyl , Isothiazolyl, isoxazolyl, pyridyl, pyrimidyl, pyrazyl, pyridazyl, pyrrolyl, furanyl, thiophenyl, imidazolyl, pyrazolyl, oxadiazolyl, thiadiazolyl, triazolyl, tetrazolyl, furazanyl and the like.
“Heteroaryloxy” refers to a group represented by (heteroaryl) -O—.
“Heteroarylamino” refers to a group represented by (heteroaryl) -NH—.
“Heteroarylcarbonyl” refers to a group represented by (heteroaryl) -C (O) —.
“Heteroarylcarbonylamino” refers to a group represented by (heteroaryl) -C (O) NH—.

Examples of the 5- to 8-membered ring which may be formed together with the atoms in the indolizine ring to which two R ² , R ^2a and R ^2b , or R ^2b and R ^2c are respectively bonded, include, for example, methyl or Examples include cyclopentyl, cyclohexyl, [1,4] dioxyl, [1,3] dioxolyl and the like, which may have methoxy.

“It may be substituted with a fluorine atom” means that it may have 1 to 5 fluorine atoms as a substituent. In addition, when the group which may be substituted with a fluorine atom is methyl, methoxy or N-methylamino, it means that it may have 1 to 3 fluorine atoms, and when it is hydroxymethyl It means that it may have 1 or 2 fluorine atoms.
“It may have any group selected from the substituent group α” means that it may have 1 to 3 identical or different groups selected from the substituent group α; It is preferably unsubstituted or one. However, when the group selected from the substituent group α is a fluorine atom, it is synonymous with the above-mentioned “may be substituted with a fluorine atom”.

“Mono (di) hydroxyC _1-6 alkyl” refers to the above C _1-6 alkyl substituted with one or two hydroxyl groups.
The _{"C 1-6} alkoxy _{C 1-6} alkoxy _{C 1-6} alkyl", further refers to _{C 1-6} alkyl substituted by the above _{C 1-6} alkoxy substituted by the above _{C 1-6} alkoxy.
“Mono (di) C _1-6 alkylamino C _1-6 alkyl” refers to the above C _1-6 alkyl substituted with the above mono (di) C _1-6 alkylamino.
“3-8 membered heterocycloalkyl C _1-6 alkyl” refers to the above C _1-6 alkyl substituted with the above 3-8 membered heterocycloalkyl.
“Amino C _1-6 alkylene” refers to the above C _1-6 alkylene substituted with an amino group.

式中のＲ^１ａは水素原子又は水酸基；Ｒ^20ａは水素原子、フッ素原子、塩素原子、メチル又はメトキシ；Ｒ^20ｂは水素原子、塩素原子、メチル、エチル、メトキシ、モノフルオロメチル又はトリフルオロメチル；Ｒ^20ｃは水素原子、フッ素原子、塩素原子、メチル又はトリフルオロメチル；である。
また別の好ましい態様として、下記一般式（ＩＢ）で表されるインドリジン誘導体が挙げられる。

式中のＲ^21ａは水素原子、フッ素原子又は塩素原子；Ｒ^21ｂは水素原子、メチル、モノフルオロメチル又はトリフルオロメチル；である。
また別の好ましい態様として、下記一般式（ＩＣ）で表されるインドリジン誘導体が挙げられる。

式中のＲ^22aは水素原子又はフッ素原子；Ｒ^22ｂは水素原子、メチル、メトキシ、モノフルオロメチル又はトリフルオロメチル；Ｒ^22cは水素原子、フッ素原子、塩素原子、メチル又はトリフルオロメチル；である。In the present invention, one preferred embodiment is, for example, an indolizine derivative represented by the following general formula (IA).

R ^1a in the formula is hydrogen atom or hydroxyl group; R ^20a is hydrogen atom, fluorine atom, chlorine atom, methyl or methoxy; R ^20b is hydrogen atom, chlorine atom, methyl, ethyl, methoxy, monofluoromethyl or trifluoromethyl; R ^20c is a hydrogen atom, a fluorine atom, a chlorine atom, methyl or trifluoromethyl;
Another preferred embodiment is an indolizine derivative represented by the following general formula (IB).

In the formula, R ^21a is a hydrogen atom, a fluorine atom or a chlorine atom; R ^21b is a hydrogen atom, methyl, monofluoromethyl or trifluoromethyl;
Another preferred embodiment is an indolizine derivative represented by the following general formula (IC).

In the formula, R ^22a is a hydrogen atom or a fluorine atom; R ^22b is a hydrogen atom, methyl, methoxy, monofluoromethyl or trifluoromethyl; R ^22c is a hydrogen atom, a fluorine atom, a chlorine atom, methyl or trifluoromethyl; .

  The indolizine derivative represented by the formula (I) of the present invention can be produced, for example, according to the following method or a method equivalent thereto, other methods described in the literature or methods equivalent thereto, and the like. In addition, when a protecting group is necessary, it can be carried out by appropriately combining introduction and desorption operations according to a conventional method. Each reaction can also be performed using a pressure-resistant reaction vessel as necessary.

式中の環Ｕ、Ｒ^１、Ｒ^２、Ｒ^３、ｍ及びｎは前記と同じ意味をもつ。[Production method 1]

Rings U, R ¹ , R ² , R ³ , m and n in the formula have the same meaning as described above.

Process 1
The aldehyde compound ( 3 ) can also be produced by formylating the compound ( 2 ) in the presence of N, N-dimethylformamide and phosphorus oxychloride in an inert solvent. Examples of the inert solvent include N, N-dimethylformamide, benzene, toluene, chlorobenzene, dichloromethane, 1,2-dichloroethane, chloroform, and mixed solvents thereof. The reaction temperature is usually from 0 ° C. to reflux temperature, and the reaction time is usually from 30 minutes to 7 days, although it varies depending on the raw material used, solvent, reaction temperature and the like.

Process 2
By subjecting the aldehyde compound ( 3 ) to cyanidation using hydroxylamine or its hydrochloride in an inert solvent in the presence or absence of a base, in the presence or absence of a condensing agent, The lysine derivative (I) can also be produced. Examples of the inert solvent include N, N-dimethylformamide, acetonitrile, benzene, toluene, chlorobenzene, dichloromethane, 1,2-dichloroethane, chloroform, tetrahydrofuran, 1,4-dioxane, N-methylpyrrolidone, and mixed solvents thereof. Can be mentioned. Examples of the base include triethylamine, N, N-diisopropylethylamine, pyridine, 2,6-lutidine, 1,8-diazabicyclo [5.4.0] -7-undecene, potassium carbonate, sodium carbonate and the like. Examples of the condensing agent include acetic anhydride, thionyl chloride, phosphorus pentachloride, N, N-dicyclohexylcarbodiimide, N, N′-carbonylimidazole and the like. The reaction temperature is usually from 0 ° C. to reflux temperature, and the reaction time is usually from 30 minutes to 7 days, although it varies depending on the raw materials and solvents used, the reaction temperature and the like.

In the above cyanation reaction, the aldehyde compound ( 3 ) may be reacted with sodium formate in a formic acid solvent with hydroxylamine or its hydrochloride. The reaction temperature is usually from 0 ° C. to reflux temperature, and the reaction time is usually from 30 minutes to 7 days, although it varies depending on the raw materials and solvents used, the reaction time and the like.

Process 3
Bromination compound ( 4 ) can also be manufactured by brominating compound ( 2 ) in presence of bromination reagents, such as N-bromosuccinimide, in an inert solvent. Examples of the inert solvent include dichloromethane, 1,2-dichloroethane, chloroform, carbon tetrachloride, acetic acid, acetonitrile, methanol, dimethylformamide, and mixed solvents thereof. The reaction temperature is usually from 0 ° C. to reflux temperature, and the reaction time is usually from 30 minutes to 7 days, although it varies depending on the raw material used, solvent, reaction temperature and the like.

Process 4
The indolizine derivative (I) of the present invention can also be produced by cyanating the brominated compound ( 4 ) in the presence of a palladium catalyst and zinc cyanide in an inert solvent. Examples of the inert solvent include benzene, toluene, xylene, diethyl ether, tetrahydrofuran, 1,4-dioxane, 1,2-dimethoxyethane, dichloromethane, 1,2-dichloroethane, chloroform, methanol, ethanol, 2-propanol, butanol, N, N-dimethylformamide, N-methylpyrrolidone, dimethyl sulfoxide, water, a mixed solvent thereof and the like can be mentioned. Examples of the palladium catalyst include tetrakis (triphenylphosphine) palladium, dichlorobis (triphenylphosphine) palladium, palladium chloride-1,1′-bis (diphenylphosphino) ferrocene. The reaction temperature is usually from 0 ° C. to reflux temperature, and the reaction time is usually from 30 minutes to 7 days, although it varies depending on the raw material used, solvent, reaction temperature and the like.

Among the indolizine derivatives represented by the formula (I) of the present invention, the indolizine derivative (Ib) in which R ³ is a hydrogen atom can also be produced by the following production methods 2 and 3.

式中のＬ^１は塩素原子、臭素原子、ヨウ素原子、トリフルオロメタンスルホニルオキシ基等の脱離基であり、環Ｕ、Ｒ^１、Ｒ^２、ｍ及びｎは前記と同じ意味をもつ。[Production method 2]

L ¹ in the formula is a leaving group such as a chlorine atom, a bromine atom, an iodine atom, a trifluoromethanesulfonyloxy group, and the rings U, R ¹ , R ² , m, and n have the same meaning as described above.

Process 5
The indolizine derivative (Ib) of the present invention can also be produced by performing a coupling reaction between the indolizine compound ( 5 ) and the compound ( 6 ) in the presence of a base and a palladium catalyst in an inert solvent. As an inert solvent, benzene, toluene, xylene, diethyl ether, tetrahydrofuran, 1,4-dioxane, 1,2-dimethoxyethane, dichloromethane, 1,2-dichloroethane, chloroform, N, N-dimethylformamide, N-methyl Examples include pyrrolidone, dimethyl sulfoxide, water, and mixed solvents thereof. Bases include sodium acetate, potassium acetate, sodium carbonate, potassium carbonate, cesium carbonate, sodium hydroxide, potassium hydroxide, lithium hydroxide, sodium ethoxide, sodium methoxide, potassium fluoride, cesium fluoride, triethylamine, N , N-diisopropylethylamine, pyridine, 2,6-lutidine, 1,8-diazabicyclo [5,4,0] -7-undecene and the like. Examples of the palladium catalyst include dichlorobis (triphenylphosphine) palladium and palladium acetate. The reaction temperature is usually from 0 ° C. to reflux temperature, and the reaction time is usually from 30 minutes to 7 days, although it varies depending on the raw material used, solvent, reaction temperature and the like.

式中のＸは塩素、臭素、ヨウ素、メシル基、トシル基等であり、環Ｕ、Ｒ^１、Ｒ^２、ｍ及びｎは前記と同じ意味を持つ。[Production method 3]

X in the formula is chlorine, bromine, iodine, mesyl group, tosyl group and the like, and rings U, R ¹ , R ² , m and n have the same meaning as described above.

Step 6
The indolizine derivative (Ib) of the present invention can also be produced by reacting the benzotriazole compound ( 7 ) with 2-bromoacrylonitrile ( 8 ) in the presence of a base in an inert solvent. Examples of the inert solvent include acetonitrile, tetrahydrofuran, N, N-dimethylformamide, diethyl ether, N-methylpyrrolidone, ethanol, methanol, water, and mixed solvents thereof. Examples of the base include sodium hydroxide, potassium hydroxide, sodium hydride, potassium tert-butoxide, sodium methoxide, sodium ethoxide, lithium diisopropylamide, triethylamine, N, N-diisopropylethylamine and the like. The reaction temperature is usually from 0 ° C. to reflux temperature, and the reaction time is usually from 30 minutes to 7 days, although it varies depending on the raw material used, solvent, reaction temperature and the like.

The compound ( 2 ) used in the production method 1 is various according to the method described in the literature (for example, Choul-Hong Park, Org. Lett., 2004, 6, p. 1159-1162, etc.) or a method analogous thereto. It can also be produced using an indolizine compound. The indolizine compound used in this method can also be produced according to the method described in the literature (for example, David, Virieux, Tetrahedron, 2006, 62, p. 3710-3720 etc.) or a method analogous thereto.

Among the compounds used in the production method 1 (2), and R ³ is a fluorine atom (2a) can also be prepared by the following method 4 methods.

式中のＰは保護基であり、環Ｕ、Ｒ^１、Ｒ^２、ｍ、ｎ及びＸは前記と同じ意味をもつ。[Production method 4]

P in the formula is a protecting group, and the rings U, R ¹ , R ² , m, n and X have the same meaning as described above.

Step 7
Compound ( 11 ) can also be produced by reacting compound ( 9 ) with compound ( 10 ) in the presence of a base in an inert solvent. Examples of the inert solvent include N, N-dimethylformamide, N-methylpyrrolidone, dimethyl sulfoxide, diethyl ether, tetrahydrofuran, 1,4-dioxane, 1,2-dimethoxyethane, benzene, toluene, xylene, and mixed solvents thereof. Is mentioned. Examples of the base include potassium carbonate, sodium carbonate, cesium carbonate, sodium hydroxide, potassium hydroxide, lithium hydroxide, potassium fluoride, cesium fluoride, triethylamine, pyridine, N, N-diisopropylethylamine, 2,6-lutidine, 1,8-diazabicyclo [5,4,0] -7-undecene and the like. The reaction temperature is usually from 0 ° C. to reflux temperature, and the reaction time is usually from 30 minutes to 7 days, although it varies depending on the raw material used, solvent, reaction temperature and the like.

Process 8
Compound ( 12 ) can also be produced by deprotecting compound ( 11 ) and subjecting the resulting carboxylic acid compound to a decarboxylation reaction in an inert solvent in the presence or absence of a catalyst. Examples of the inert solvent include quinoline, polyphosphoric acid, acetic acid, trifluoroacetic acid, hydrochloric acid, sulfuric acid, methanol, and mixed solvents thereof. Examples of the catalyst include copper. The reaction temperature is usually from 0 ° C. to the reflux temperature, and the reaction time is usually from 30 minutes to 7 days, although it varies depending on the raw material used, solvent, reaction temperature and the like.

Step 9
Compound ( 2a ) can also be produced by coupling compound ( 12 ) and compound ( 6 ) in the same manner as in step 5.

The indolizine compound ( 5 ) used in the production method 2 can also be produced, for example, by the following production methods 5 and 6.

式中のＬ^２は塩素原子、臭素原子、ヨウ素原子、メシル基、トシル基等の脱離基であり、Ｒ^２、ｎ及びＸは前記と同じ意味をもつ。[Production method 5]

In the formula, L ² is a leaving group such as a chlorine atom, a bromine atom, an iodine atom, a mesyl group, a tosyl group, and R ² , n, and X have the same meaning as described above.

Step 10
Compound ( 15 ) can also be produced by reacting compound ( 13 ) with compound ( 14 ) in an inert solvent. As an inert solvent, ethyl acetate, acetone, diethyl ether, tetrahydrofuran, 1,4-dioxane, 1,2-dimethoxyethane, dichloromethane, 1,2-dichloroethane, chloroform, N, N-dimethylformamide, N-methylpyrrolidone , Dimethyl sulfoxide, benzene, toluene, xylene, methanol, ethanol, 2-propanol, and mixed solvents thereof. The reaction temperature is usually from 0 ° C. to reflux temperature, and the reaction time is usually from 30 minutes to 7 days, although it varies depending on the raw materials and solvents used, the reaction temperature and the like.

Step 11
The indolizine compound ( 5 ) can also be produced by reacting the compound ( 15 ) with acrylonitrile in the presence of a base and manganese dioxide in an inert solvent. Examples of inert solvents include benzene, toluene, xylene, diethyl ether, 1,2-dimethoxyethane, dichloromethane, 1,2-dichloroethane, chloroform, N, N-dimethylformamide, N-methylpyrrolidone, and mixed solvents thereof. Can be mentioned. Examples of the base include triethylamine, N, N-diisopropylethylamine, pyridine, 2,6-lutidine, 1,8-diazabicyclo [5,4,0] -7-undecene and the like. The reaction temperature is usually from 0 ° C. to reflux temperature, and the reaction time is usually from 30 minutes to 7 days, although it varies depending on the raw materials and solvents used, the reaction temperature and the like.

式中のＲ^２、ｎ及びＸは前記と同じ意味をもつ。[Production method 6]

R ² , n and X in the formula have the same meaning as described above.

Step 12
The indolizine compound ( 5 ) can also be produced by reacting the benzotriazole derivative ( 16 ) with 2-bromoacrylonitrile ( 8 ) in the same manner as in Step 6.

The triazole compounds ( 7 ) and ( 16 ) used in the production method described in the literature (for example, Katritzky, AR, J. Org. Chem., 1999, 64, p. It can also be produced according to a method or the like.

As the protecting group used in the present invention, various protecting groups generally used in organic synthesis reactions can be used. For example, the hydroxyl protecting group includes p-methoxybenzyl group, benzyl group, methoxymethyl group, acetyl group, pivaloyl group, benzoyl group, tert-butyldimethylsilyl group, tert-butyldiphenylsilyl group, allyl group, etc. When two hydroxyl groups are adjacent to each other, an isopropylidene group, a cyclopentylidene group, a cyclohexylidene group, and the like can be given. Examples of the protecting group for the thiol group include p-methoxybenzyl group, benzyl group, acetyl group, pivaloyl group, benzoyl group, and benzyloxycarbonyl group. Examples of the amino-protecting group include benzyloxycarbonyl group, tert-butoxycarbonyl group, benzyl group, p-methoxybenzyl group, trifluoroacetyl group, acetyl group, phthaloyl group and the like. Examples of the protecting group for the carboxy group include a C _1-6 alkyl group, a benzyl group, a tert-butyldimethylsilyl group, and an allyl group.

  The indolizine derivative represented by the formula (I) of the present invention can be isolated and purified by a conventional separation means, such as fractional recrystallization, purification using chromatography, solvent extraction, solid phase extraction, etc. You can also.

  The indolizine derivative represented by the formula (I) of the present invention can be converted into a pharmacologically acceptable salt thereof by a conventional method. Such salts include acid addition salts with mineral acids such as hydrochloric acid, hydrobromic acid, hydroiodic acid, sulfuric acid, nitric acid, phosphoric acid, formic acid, acetic acid, methanesulfonic acid, benzenesulfonic acid, p-toluene. Acid addition with organic acids such as sulfonic acid, propionic acid, citric acid, succinic acid, tartaric acid, fumaric acid, butyric acid, oxalic acid, malonic acid, maleic acid, lactic acid, malic acid, carbonic acid, benzoic acid, glutamic acid, aspartic acid Salt, sodium salt, potassium salt, calcium salt, magnesium salt, zinc salt, salt with inorganic base such as lithium salt, aluminum salt, N-methyl-D-glucamine, N, N′-dibenzylethylenediamine, 2-amino Ethanol, tris (hydroxymethyl) aminomethane, arginine, lysine, piperazine, choline, diethylamine, 4-phenyl-cyclohexane Addition salts with organic bases may be mentioned.

  Among the indolizine derivatives represented by the formula (I) of the present invention, the compound having an unsaturated bond includes two geometric isomers, a cis (Z) isomer compound and a trans (E) isomer compound. Although it exists, in the present invention, any of these compounds may be used, or a mixture thereof may be used.

  Among the indolizine derivatives represented by the formula (I) of the present invention, compounds having an asymmetric carbon atom include a compound having an R configuration and a compound having an S configuration for each asymmetric carbon. In, any optical isomer may be used, and a mixture of these optical isomers may be used.

  Various tautomers may exist in the indolizine derivative represented by the formula (I) of the present invention, and the compounds of the present invention also include these tautomers.

In the present invention, a prodrug refers to a compound that is converted into an indolizine derivative represented by the formula (I) in vivo. The prodrug of the indolizine derivative represented by the formula (I) of the present invention is a hydroxyl group in the indolizine derivative represented by the formula (I) by a conventional method using a corresponding prodrug-forming reagent such as a halide. In addition, a group constituting a prodrug is appropriately introduced in accordance with a conventional method into one or more arbitrary groups selected from amino group, carboxy group, and other groups capable of forming a prodrug, and if desired, according to a conventional method. It can be manufactured by isolation and purification ("Monthly Pharmaceutical Affairs Clinical Pharmacokinetics for Proper Use of Drugs", March 2000 Extra Special Issue, Vol. 42, No. 4, p. 669-707, "New "Drug delivery system", issued by CMC Co., Ltd., January 31, 2000, pages 67-173). As a group forming a prodrug used in a hydroxy group or an amino group, e.g., acetyl, propionyl, butyryl, isobutyryl, _{C 1-6} alkyl -CO- pivaloyl and the like; such benzoyl aryl _{-CO-; C 1- 6} alkyl-O—C _1-6 alkylene-CO—; C _1-6 alkyl-OCO—C _1-6 alkylene-CO—; methyloxycarbonyl, ethyloxycarbonyl, propyloxycarbonyl, isopropyloxycarbonyl, tert-butyl C _1-6 alkyl-OCO— such as oxycarbonyl; C _1-6 alkyl-O—C _1-6 alkylene-OCO—; acetyloxymethyl, pivaloyloxymethyl, 1- (acetyloxy) ethyl, 1- (pivaloyloxy) ethyl and the like _{C 1-6} alkyl _{-COO-C 1-} Alkylene; methoxycarbonyloxymethyl, 1- (methoxycarbonyloxy) ethyl, ethoxycarbonyloxymethyl, 1- (ethoxycarbonyloxy) ethyl, isopropyloxycarbonyloxy methyl, 1- (isopropyloxycarbonyloxy) ethyl, tert- butyloxy carbonyloxy, 1- (tert-butyloxycarbonyl oxy) _{C 1-6} alkyl _{-OCOO-C 1-6} alkylene-ethyl and the like; cyclohexyloxycarbonyloxy, 1- such (cyclohexyloxycarbonyl) ethyl _{C 3- 8} cycloalkyl-OCOO-C _1-6 alkylene; esters and amides with amino acids such as glycine; Examples of the group constituting the prodrug used in the carboxy group include C _1-6 alkyl such as methyl, ethyl, propyl, isopropyl, butyl, tert-butyl; pivaloyloxymethyl, acetyloxymethyl, 1- C _1-6 alkyl-COO-C _1-6 alkylene such as (pivaloyloxy) ethyl, 1- (acetyloxy) ethyl; ethyloxycarbonyloxymethyl, 1- (ethyloxycarbonyloxy) ethyl, isopropyloxycarbonyloxymethyl, 1- (isopropyloxycarbonyloxy) ethyl, tert- butyloxycarbonyl oxymethyl, 1 _{C 1-6} alkyl _{-OCOO-C 1-6} alkylene such as (tert- butyloxycarbonyl) ethyl; cyclohexyloxy carbonylation Oxymethyl, 1 _{C 3-8} cycloalkyl _{-OCOO-C 1-6} alkylene such as (cyclohexyloxycarbonyloxy) ethyl; hydroxyethyl, hydroxypropyl, 1,2-dihydroxypropyl, 1-hydroxy - (2-hydroxy Mono (di) hydroxy C _1-6 alkyl such as methyl) propyl; mono (di) hydroxy C _1-6 alkyl-OCOO-C _1-6 alkylene such as 1- (hydroxyethyloxycarbonyloxy) ethyl; methoxyethoxyethyl mono _{(di) C 1-6} alkylamino _{C 1-6} alkyl dimethylaminoethyl and the like;; _{C 1-6} alkoxy _{C 1-6} alkoxy _{C 1-6} alkyl etc. pyrrolidin-1-yl - 3, such as ethyl 8-membered heterocycloalkyl _{C 1-6} alkyl; methyloxy carbonylation It can be mentioned _{C 1-6} alkyl -OCO- amino _{C 1-6} alkylene such as (amino) ethyl.
As the prodrug of the present invention, a compound having a group constituting the above prodrug in the carboxy group is preferable. Examples of the group constituting the prodrug include hydroxyethyl, hydroxypropyl, 1,2-dihydroxypropyl, 1-hydroxy Mono (di) hydroxy C _1-6 alkyl such as-(2-hydroxymethyl) propyl; mono (di) hydroxy C _1-6 alkyl-OCOO-C _1-6 such as 1- (hydroxyethyloxycarbonyloxy) ethyl alkylene; _{C 1-6} alkoxy _{C 1-6} alkoxy _{C 1-6} alkyl, such as methoxy ethoxy ethyl, 2-hydroxyethyl, etc. mono _{(di) C 1-6} alkylamino _{C 1-6} alkyl; pyrrolidin-1-yl - 3-8 membered heterocycloalkyl C _1-6 alkyl such as ethyl; or methylo More preferred are C _1-6 alkyl-OCO-amino C _1-6 alkylene, such as xyloxycarbonyl (amino) ethyl.

  In the present invention, pharmacologically acceptable salts also include solvates with pharmacologically acceptable solvents such as water or ethanol.

  The pharmaceutical composition of the present invention is useful for the prevention or treatment of diseases associated with high serum uric acid levels such as hyperuricemia, gout nodules, gout arthritis, renal disorders due to hyperuricemia, urolithiasis, etc. Is useful for hyperuricemia.

  When the pharmaceutical composition of the present invention is used for actual prevention or treatment, the dosage of the indolizine derivative represented by formula (I) or a prodrug thereof, or a pharmacologically acceptable salt thereof, which is an active ingredient thereof Is appropriately determined depending on the patient's age, sex, body weight, disease, degree of treatment, etc. For example, in the case of oral administration, the dose is generally in the range of 1 to 2000 mg per day for an adult, divided into several doses be able to.

  When the pharmaceutical composition of the present invention is used for actual prevention or treatment, various dosage forms are used orally or parenterally depending on the usage. For example, powders, fine granules, granules, Oral preparations such as tablets, capsules and dry syrups are preferred.

  These pharmaceutical compositions are prepared according to a conventional method by appropriately mixing pharmaceutical additives such as excipients, disintegrants, binders, lubricants and the like according to the dosage form in accordance with ordinary pharmacological methods. Can be manufactured.

  For example, a powder is added to an active ingredient as needed, and an appropriate excipient | filler, a lubricant, etc. are added and mixed well to make a powder. For example, tablets are added to the active ingredients with appropriate excipients, disintegrants, binders, lubricants, etc., and compressed into tablets according to conventional methods. Tablets, sugar-coated tablets, enteric-coated skin tablets, etc. For example, a capsule is prepared by adding an appropriate excipient, lubricant, etc. to an active ingredient and mixing well, or after granulating or finely granulating it according to a conventional method, filling it into an appropriate capsule and To do. Furthermore, in the case of such an orally administered preparation, an immediate release or sustained release preparation can be prepared depending on the prevention or treatment method.

  The indolizine derivative represented by the formula (I) of the present invention or a prodrug thereof, or a pharmacologically acceptable salt thereof may be used in combination with other therapeutic agents for hyperuricemia or gout. You can also. Examples of the therapeutic agent for hyperuricemia include urine alkalizing agents such as sodium hydrogen carbonate, potassium citrate, sodium citrate and the like. Examples of the gout treatment include colchicine, non-steroidal anti-inflammatory drugs such as indomethacin, naproxen, fenbufen, pranoprofen, oxaprozin, ketoprofen, etoroxixib, tenoxicam, and steroids. When used in combination, not only a single pharmaceutical composition containing the active ingredient of the present invention and other active ingredients at the same time, but also a pharmaceutical composition containing each active ingredient separately, at the same time or at different intervals. May be. Further, the dose of the indolizine derivative of the present invention may be reduced as appropriate according to the dose of other drugs used in combination.

  The indolizine derivative represented by the formula (I) of the present invention exhibits excellent xanthine oxidase inhibitory activity and suppresses uric acid production. Preferred compounds of the present invention also exhibit excellent URAT1 inhibitory activity and promote uric acid excretion. Therefore, the indolizine derivative represented by the formula (I) of the present invention or a prodrug thereof, or a pharmacologically acceptable salt thereof can remarkably suppress an increase in serum uric acid level, and hyperuricemia It is useful as a preventive or therapeutic agent for diseases caused by abnormal serum uric acid levels.

  The content of the present invention will be described in more detail with reference examples, examples and test examples below, but the present invention is not limited to the content.

Reference example 1
To a solution of indolizine-1-carbonitrile pyridine (4.0 g) in ethyl acetate (10 mL) was added chloroacetic acid (4.7 g) at room temperature and refluxed overnight. After cooling the reaction mixture to room temperature, the precipitated solid was collected by filtration and dried under reduced pressure to obtain 1-carboxymethylpyridinium chloride (5.7 g). Acrylonitrile (8.7 g), manganese dioxide (16.4 g) and triethylamine (4.0 g) were added to a toluene (300 mL) solution of the obtained compound (5.7 g), and the mixture was stirred at 100 ° C. for 5 hours. The reaction mixture was filtered through celite, and the filtrate was concentrated under reduced pressure. The residue was purified by silica gel column chromatography (eluent: n-hexane / ethyl acetate) to obtain the title compound (2.8 g).

Reference Examples 2-12
In the same manner as in Reference Example 1, the compounds of Reference Examples 2 to 12 were synthesized using corresponding raw materials.

Reference Example 13
7-trifluoromethylindolizine-1-carbonitrile Bromoacetic acid (1.4 g) was added to a solution of 4-trifluoromethylpyridine (2.0 g) in ethyl acetate (10 mL) at room temperature and refluxed overnight. After cooling the reaction mixture to room temperature, the precipitated solid was collected by filtration and dried under reduced pressure to obtain 1-carboxymethyl-4-trifluoromethylpyridinium bromide (1.0 g). Acrylonitrile (0.93 g), manganese dioxide (0.91 g) and triethylamine (0.42 g) were added to a toluene (10 mL) solution of the obtained compound (1.0 g), and the mixture was stirred at 100 ° C. for 5 hours. The reaction mixture was filtered through celite, and the filtrate was concentrated under reduced pressure. The residue was purified by silica gel column chromatography (eluent: n-hexane / ethyl acetate) to obtain the title compound (0.31 g).

Reference Examples 14-16
In the same manner as in Reference Example 13, the compounds of Reference Examples 14 to 16 were synthesized using corresponding raw materials.

Reference Example 17
In the same manner as in Reference Example 1, the compound of Reference Example 17 was synthesized using the corresponding starting materials.

Reference Example 18
7-hydroxymethylindolizine-1-carbonitrile 1-cyanoindolizine-7-carboxylate (0.42 g) in tetrahydrofuran (4.2 mL), ethanol (2.1 mL), water (2.1 mL) mixed solution Lithium hydroxide (0.25 g) was added at room temperature, and the mixture was stirred overnight at the same temperature. The reaction mixture was acidified with 2N hydrochloric acid, and the precipitated solid was collected by filtration. This solid was washed with water and n-hexane to obtain 1-cyanoindolizine-7-carboxylic acid (0.29 g).
To a solution of 1-cyanoindolizine-7-carboxylic acid (0.20 g) in tetrahydrofuran (4.0 mL) was added 3-methylbutyryl chloride (0.16 g) and 4-methylmorpholine (0.13 g) under ice-cooling. And stirred at room temperature for 1 hour. The reaction mixture was filtered to remove insolubles, ethanol (4.0 mL) was added to the filtrate, sodium borohydride (0.20 g) was added under ice cooling, and the mixture was stirred overnight at room temperature. 2N Hydrochloric acid (5.0 mL) was added to the reaction mixture, and the mixture was extracted with ethyl acetate. The organic layer is dried over magnesium sulfate and concentrated, and the residue is purified by silica gel column chromatography (eluent: ethyl acetate / n-hexane = 30 / 70-100 / 0) to give the title compound (0.050 g). It was.

Reference Examples 19-31
In the same manner as in Reference Example 13, the compounds of Reference Examples 19 to 31 were synthesized using corresponding raw materials.

Reference Example 32
7-methoxyindolizine-1-carbonitrile To a solution of 4-methoxypyridine (3.0 g) in ethyl acetate (30 mL) was added methyl bromoacetate (4.6 g), and the mixture was refluxed overnight. After allowing to cool, the precipitated solid was collected by filtration and dried under reduced pressure to give 4-methoxy-1-methoxycarbonylmethylpyridinium bromide (7.0 g). Acrylonitrile (6.1 g), manganese dioxide (6.0 g) and triethylamine (2.8 g) were added to a toluene (50 mL) solution of the obtained compound (6.0 g), and the mixture was stirred at 100 ° C. for 5 hours. The reaction mixture was filtered through celite, and the filtrate was concentrated under reduced pressure. The residue was purified by silica gel column chromatography (elution solvent: n-hexane / ethyl acetate) to obtain methyl 1-cyano-7-methoxyindolizine-3-carboxylate (1.0 g). Lithium hydroxide monohydrate (0.27 g) was added to a mixed solution of the obtained compound (1.0 g) in tetrahydrofuran (20 mL), ethanol (7 mL) and water (7 mL), and the mixture was stirred overnight at room temperature. did. 1N Hydrochloric acid and water were added to the reaction mixture, and the precipitated solid was collected by filtration, washed with water and n-hexane, dried at 50 ° C. under reduced pressure, and 1-cyano-7-methoxyindolizine-3-carboxylic acid. The acid (0.80 g) was obtained. Copper (0.05 g) was added to a suspension of the obtained compound (0.80 g) and quinoline (8 mL), and the mixture was stirred at 220 ° C. for 30 minutes. After allowing to cool, 1N hydrochloric acid was added to the reaction mixture, and the mixture was extracted with ethyl acetate. The organic layer was washed with 1N hydrochloric acid, water and saturated brine, and dried over magnesium sulfate. The residue was purified by silica gel column chromatography (elution solvent: n-hexane / ethyl acetate) to obtain the title compound (0.37 g).

Reference Example 33
7-Dimethylaminoindolizine-1-carbonitrile In the same manner as in Reference Example 32, the compound of Reference Example 33 was synthesized using the corresponding starting materials.

Reference Example 34
7-Methoxy-6-methylindolizine-1-carbonitrile In the same manner as in Reference Example 32, the compound of Reference Example 34 was synthesized using the corresponding starting materials.

Reference Example 35
4- (1-cyano-7-isopropoxy-8-trifluoromethylindolizin-3-yl) benzoic acid methyl 4-chloro-3-trifluoromethylpyridine hydrochloride (2.0 g) in tetrahydrofuran (5 mL) Under ice cooling, sodium hydride (60%, 2.8 g) and propan-2-ol (2.8 g) were added, and the mixture was stirred at 50 ° C. for 2 hours. After allowing to cool, water was added to the reaction mixture, and the mixture was extracted with diethyl ether. The organic layer was dried over magnesium sulfate and concentrated. The residue was purified by silica gel column chromatography (eluent: n-hexane / ethyl acetate) to give 4-isopropoxy-3-trifluoromethylpyridine (1.5 g). Obtained. To a solution of the obtained compound (1.5 g) in ethyl acetate (20 mL) was added methyl 4-bromomethylbenzoate (2.0 g) at room temperature, and the mixture was refluxed overnight. After allowing to cool, the solvent was removed to give 4-isopropoxy-1- (4-methoxycarbonylbenzyl) -3-trifluoromethylpyridinium bromide (2.1 g). Acrylonitrile (1.3 g), manganese dioxide (2.1 g) and triethylamine (1.5 g) were added to a solution of the obtained compound (2.1 g) in dimethoxyethane (10 mL), and the mixture was stirred at 80 ° C. for 6 hours. . The reaction mixture was filtered through celite, and the filtrate was concentrated under reduced pressure. The residue was purified by silica gel column chromatography (eluent: n-hexane / ethyl acetate) to obtain the title compound (0.04 g).

Reference Example 36
1-Bromo-2-fluoroindolizine To a solution of 1-ethoxycarbonylmethylpyridinium bromide (4.8 g) in N, N-dimethylformamide (50 mL) at room temperature under toluene-2-sulfonic acid 2,2-difluorovinyl (4 0.6 g), potassium carbonate (4.0 g), and triethylamine (3.0 g) were added, and the mixture was stirred at 70 ° C. overnight. After allowing to cool, water was poured into the reaction mixture, and the mixture was extracted with ethyl acetate. The organic layer was washed with water and saturated brine, and dried over magnesium sulfate. After concentration under reduced pressure, the residue was purified by silica gel column chromatography (elution solvent: n-hexane / ethyl acetate) to obtain ethyl 2-fluoroindolizine-3-carboxylate (1.9 g). N-bromosuccinimide (1.8 g) was added to a solution of the obtained compound (1.9 g) in dichloromethane (30 mL), and the mixture was stirred at room temperature for 2 hours. A 1N aqueous sodium thiosulfate solution was poured into the reaction mixture, and the mixture was extracted with dichloromethane. The organic layer was washed with water and saturated brine, and dried over magnesium sulfate. The residue was purified by silica gel column chromatography (elution solvent: n-hexane / ethyl acetate) to obtain ethyl 1-bromo-2-fluoroindolizine-3-carboxylate (1.3 g). . Lithium hydroxide monohydrate (0.29 g) was added to a mixed solution of the obtained compound (1.3 g) in tetrahydrofuran (20 mL), ethanol (7 mL) and water (7 mL), and the mixture was stirred overnight at room temperature. did. 1N Hydrochloric acid and water were added to the reaction mixture, and the precipitated solid was collected by filtration, washed with water and n-hexane, dried at 50 ° C. under reduced pressure, and 1-bromo-2-fluoroindolizine-3-carboxylic acid. Acid (0.76 g) was obtained. Copper (0.03 g) was added to a suspension of the obtained compound (0.56 g) and quinoline (5 mL), and the mixture was stirred at 220 ° C. for 30 minutes. After allowing to cool, 1N hydrochloric acid was added to the reaction mixture, and the mixture was extracted with ethyl acetate. The organic layer was washed with 1N hydrochloric acid, water and saturated brine, and dried over magnesium sulfate. The residue was purified by silica gel column chromatography (elution solvent: n-hexane / ethyl acetate) to obtain the title compound (0.47 g).

Reference Example 37
Ethyl 5-bromo-3-methoxymethoxypyridine-2-carboxylate A solution of 5-bromo-3-hydroxypyridine-2-carboxylic acid (2.18 g) in ethanol (20 mL) under ice-cooling was thionyl chloride (4.76 g). ) And stirred at 80 ° C. for 24 hours. After cooling, the solvent was removed. Chloromethoxymethane (2.01 g) was added dropwise to a solution of the obtained compound (2.05 g) and diisopropylethylamine (5.38 g) in dichloromethane (17 mL) under ice cooling, and the mixture was stirred at room temperature for 4 hours. Hydrochloric acid and water were added to the reaction mixture, extracted with ethyl acetate, and the organic layer was dried over magnesium sulfate. The residue was purified by silica gel column chromatography (elution solvent: n-hexane / ethyl acetate) to obtain the title compound (2.26 g).

Example 1
4- (1-Cyanoindolizin-3-yl) benzoic acid To a solution of indolizine-1-carbonitrile (0.80 g) in N-methylpyrrolidone (16 mL) at room temperature, methyl 4-iodobenzoate (1.60 g ), Dichlorobis (triphenylphosphine) palladium (II) (0.20 g), potassium acetate (1.10 g) and water (0.2 mL) were added, and the mixture was stirred at 100 ° C. for 3 hours. After allowing to cool, water was poured into the reaction mixture, and the mixture was extracted with ethyl acetate. The organic layer was washed with water and saturated brine, and dried over magnesium sulfate. After concentration under reduced pressure, the residue was purified by silica gel column chromatography (eluent: n-hexane / ethyl acetate = 100/0 to 34/66) to give 4- (1-cyanoindolizin-3-yl) benzoic acid. Methyl acid (0.45 g) was obtained. Lithium hydroxide monohydrate (0.20 g) was added to a mixed solution of the obtained compound (0.45 g) in tetrahydrofuran (10 mL), ethanol (5 mL) and water (5 mL), and the mixture was stirred overnight at room temperature. did. 1N Hydrochloric acid and water were added to the reaction mixture, and the precipitated solid was collected by filtration, washed with water and n-hexane, and dried at 50 ° C. under reduced pressure to obtain the title compound (0.42 g).

Examples 2-16
In the same manner as in Example 1, the compounds of Examples 2 to 16 were synthesized using corresponding raw materials.

Example 17
4- (1-Cyanoindolizin-3-yl) -2-hydroxybenzoic acid To a solution of indolizine-1-carbonitrile (0.20 g) in N-methylpyrrolidone (5 mL) at room temperature, 4-iodo-2- Methyl methoxymethoxybenzoate (0.5 g), dichlorobis (triphenylphosphine) palladium (II) (0.05 g), potassium acetate (0.28 g) and water (0.05 mL) were added, and the mixture was at 100 ° C. for 1 hour. Stir. After allowing to cool, water was poured into the reaction mixture, and the mixture was extracted with ethyl acetate. The organic layer was washed with water and saturated brine, and dried over magnesium sulfate. The residue was purified by silica gel column chromatography (eluent: n-hexane / ethyl acetate = 100 / 0-0 / 100) and purified by 4- (1-cyanoindolizin-3-yl) -2. -Methyl methoxymethoxybenzoate (0.17 g) was obtained. Lithium hydroxide monohydrate (0.10 g) was added to a mixed solution of the obtained compound (0.17 g) in tetrahydrofuran (4.5 mL), ethanol (1.5 mL) and water (1.5 mL), Stir at room temperature overnight. 2N Hydrochloric acid (1.5 mL) was added to the reaction mixture, and the mixture was stirred at 50 ° C. overnight. After allowing to cool, water was added to the reaction mixture, and the precipitated solid was collected by filtration. This solid was washed with water and n-hexane and dried at 50 ° C. under reduced pressure to obtain the title compound (0.11 g).

Examples 18-27
In the same manner as in Example 17, the compounds of Examples 18 to 27 were synthesized using corresponding raw materials.

Examples 28 and 29
In the same manner as in Example 1, the compounds of Examples 28 and 29 were synthesized using the corresponding starting materials.

Example 30
2-Amino-4- (1-cyanoindolizin-3-yl) benzoic acid 4- (1-Cyanoindolizin-3-yl) -2-benzoate in the same manner as in Example 1 using the corresponding starting material Ethyl nitrobenzoate (0.13 g) was obtained. To a solution of the obtained compound (0.13 g) in ethyl acetate (10 mL) was added palladium carbon (0.02 g), and the mixture was stirred overnight at room temperature in a hydrogen atmosphere. Insoluble matter was collected by filtration, the filtrate was concentrated under reduced pressure, and the residue was purified by silica gel column chromatography (eluent: n-hexane / ethyl acetate = 100/0 to 0/100) to give 2-amino-4. Ethyl-(1-cyanoindolizin-3-yl) benzoate (0.02 g) was obtained. Lithium hydroxide monohydrate (0.01 g) was added to a mixed solution of the obtained compound (0.02 g) in tetrahydrofuran (0.6 mL), ethanol (0.2 mL) and water (0.2 mL). Stir at room temperature overnight. 1N Hydrochloric acid and water were added to the reaction mixture, and the precipitated solid was collected by filtration, washed with water and n-hexane, and dried at 50 ° C. under reduced pressure to obtain the title compound (0.01 g).

Example 31
4- (1-cyano-7-fluoromethylindolizin-3-yl) benzoic acid To a solution of 7-hydroxymethylindolizine-1-carbonitrile (0.05 g) in N-methylpyrrolidone (2.0 mL) 4- Methyl bromobenzoate (0.031 g), dichlorobis (triphenylphosphine) palladium (0.005 g), water (0.005 g) and potassium acetate (0.029 g) were added and stirred at 100 ° C. for 2 hours. After cooling to room temperature, acetone, ethyl acetate and water were added, and the two layers were separated. The organic layer is washed with water and concentrated. The residue is purified by silica gel column chromatography (elution solvent: ethyl acetate / n-hexane = 10/90 to 80/20), and the resulting solid is washed with diethyl ether. Methyl 4- (1-cyano-7-hydroxymethylindolizin-3-yl) benzoate (0.026 g) was obtained. To a suspension of the obtained compound (0.025 g) in dichloromethane (2.0 mL) was added N, N-diethylaminosulfur trifluoride (0.036 g) under ice cooling, and the mixture was stirred at the same temperature for 1 hour. A saturated sodium bicarbonate solution was added to the reaction mixture, and the mixture was extracted with diethyl ether. The organic layer was washed with water, dried over magnesium sulfate, and concentrated. The residue was subjected to silica gel column chromatography (elution solvent: ethyl acetate / n-hexane) to obtain methyl 4- (1-cyano-7-fluoromethylindolizin-3-yl) benzoate (0.021 g). Lithium hydroxide (0.008 g) was added to a mixed solution of the obtained compound (0.021 g) in tetrahydrofuran (1.0 mL), ethanol (0.5 mL), and water (0.5 mL) at room temperature, and the same temperature was maintained. And stirred overnight. The reaction mixture was acidified with 2N hydrochloric acid and extracted with ethyl acetate. The organic layer was washed with water, dried over magnesium sulfate and concentrated to obtain the title compound (0.005 g).

Example 32
In the same manner as in Example 1, the compound of Example 32 was synthesized using the corresponding starting materials.

Examples 33-34
In the same manner as in Example 1, the compounds of Examples 33 to 34 were synthesized using corresponding raw materials.

Example 35
In the same manner as in Example 1, the compound of Example 35 was synthesized using methyl 4-bromo-2-methylbenzoate instead of methyl 4-iodobenzoate.

Examples 36-46
In the same manner as in Example 1, the compounds of Examples 36 to 46 were synthesized using the corresponding starting materials.

Example 47
4- (1-cyano-7-isopropoxy-8-trifluoromethylindolizin-3-yl) benzoic acid 4- (1-cyano-7-isopropoxy-8-trifluoromethylindolizin-3-yl) Lithium hydroxide monohydrate (0.01 g) was added to a mixed solution of methyl benzoate (0.04 g) in tetrahydrofuran (2 mL), ethanol (1 mL) and water (1 mL), and the mixture was stirred overnight at room temperature. . 1N Hydrochloric acid and water were added to the reaction mixture, and the precipitated solid was collected by filtration, washed with water and n-hexane, and dried at 50 ° C. under reduced pressure to obtain the title compound (0.02 g).

Examples 48-60
By the method similar to Example 17, the compound of Examples 48-60 was synthesize | combined using the corresponding raw material.

Example 61
4- (1-cyano-2-fluoroindolizin-3-yl) benzoic acid To a solution of 1-bromo-2-fluoroindolizine (0.15 g) in N-methylpyrrolidone (2.5 mL) was added 4-bromobenzoic acid. Methyl acid (0.18 g), dichlorobis (triphenylphosphine) palladium (II) (0.02 g), potassium acetate (0.13 g) and water (0.03 mL) were added, and the mixture was stirred at 100 ° C. for 3 hours. . After allowing to cool, water was poured into the reaction mixture, and the mixture was extracted with ethyl acetate. The organic layer was washed with water and saturated brine, and dried over magnesium sulfate. The residue was purified by silica gel column chromatography (elution solvent: n-hexane / ethyl acetate), and methyl 4- (1-bromo-2-fluoroindolizin-3-yl) benzoate (0. 17 g) was obtained. To a solution of the obtained compound (0.17 g) in N-methylpyrrolidone (2 mL), zinc cyanide (0.23 g) and tetrakis (triphenylphosphine) palladium (0.21 g) were added, and a microwave reactor was added. And stirred at 150 ° C. for 1 hour. Water was poured into the reaction mixture and extracted with ethyl acetate. The organic layer was washed with water and saturated brine, and dried over magnesium sulfate. The mixture was concentrated under reduced pressure, and the residue was washed with diethyl ether to obtain methyl 4- (1-cyano-2-fluoroindolizin-3-yl) benzoate (0.10 g). Lithium hydroxide monohydrate (0.07 g) was added to a mixed solution of the obtained compound (0.10 g) in tetrahydrofuran (4.0 mL), ethanol (1.5 mL) and water (1.5 mL). Stir at room temperature overnight. 1N Hydrochloric acid and water were added to the reaction mixture, and the precipitated solid was collected by filtration, washed with water and methanol, and then dried at 50 ° C. under reduced pressure to obtain the title compound (0.07 g).

Example 62
4- (1-cyano-2-fluoroindolizin-3-yl) -2-hydroxybenzoic acid To a solution of 1-bromo-2-fluoroindolizine (0.30 g) in N-methylpyrrolidone (6.0 mL), Add methyl 4-iodo-2-methoxymethoxybenzoate (0.54 g), dichlorobis (triphenylphosphine) palladium (II) (0.05 g), potassium acetate (0.27 g) and water (0.05 mL) , And stirred at 100 ° C. for 5 hours. After allowing to cool, water was poured into the reaction mixture, and the mixture was extracted with ethyl acetate. The organic layer was washed with water and saturated brine, and dried over magnesium sulfate. After concentration under reduced pressure, the residue was purified by silica gel column chromatography (eluent: n-hexane / ethyl acetate), and 4- (1-bromo-2-fluoroindolizin-3-yl) -2-methoxymethoxybenzoate. Methyl acid (0.39 g) was obtained. To a solution of the obtained compound (0.39 g) in N-methylpyrrolidone (3 mL), zinc cyanide (0.44 g) and tetrakis (triphenylphosphine) palladium (0.22 g) were added, and a microwave reactor was added. And stirred at 150 ° C. for 1 hour. Water was poured into the reaction mixture and extracted with ethyl acetate. The organic layer was washed with water and saturated brine, and dried over magnesium sulfate. The mixture was concentrated under reduced pressure, and the residue was washed with diethyl ether to obtain methyl 4- (1-cyano-2-fluoroindolizin-3-yl) -2-methoxymethoxybenzoate (0.07 g). Lithium hydroxide monohydrate (0.04 g) was added to a mixed solution of the obtained compound (0.07 g) in tetrahydrofuran (3.0 mL), ethanol (1.0 mL) and water (1.0 mL), Stir at room temperature overnight. 2N Hydrochloric acid (1.0 mL) was added to the reaction mixture, and the mixture was stirred at 50 ° C. overnight. After allowing to cool, water was added to the reaction mixture, and the precipitated solid was collected by filtration. This solid was washed with water and methanol and then dried at 50 ° C. under reduced pressure to obtain the title compound (0.05 g).

Example 63
4- (1-Cyano-7-fluoromethylindolizin-3-yl) -2-hydroxy-benzoic acid The compound of Example 63 was synthesized in the same manner as in Example 31, using the corresponding starting materials.

Example 64
The compound of Example 64 was synthesized in the same manner as in Example 1 using the corresponding starting materials.

Examples 65-67
In the same manner as in Example 17, the compounds of Examples 65 to 67 were synthesized using ethyl 5-bromo-3-methoxymethoxypyridine-2-carboxylate instead of 4-iodo-2-methoxymethoxybenzoic acid. did.

Examples 68-71
In the same manner as in Example 1, the compounds of Examples 68 to 71 were synthesized using corresponding raw materials.

Examples 72-73
In the same manner as in Example 1, the compounds of Examples 72 and 73 were synthesized using corresponding raw materials.

The chemical structural formulas and ¹ H-NMR data of Reference Example Compounds 1 to 37 and Example Compounds 1 to 73 are shown in Tables ¹ to 16.
The abbreviations in the table are Ref No. Is a reference example number, Ex No. Is an example number, Str. Represents a chemical structural formula, and Solv represents a ¹ H-NMR measurement solvent, respectively.

Test example 1
Xanthine oxidase inhibitory activity (1) Preparation of test compound The test compound was dissolved in DMSO (manufactured by Wako Pure Chemical Industries) to a concentration of 40 mM, and then diluted with phosphate buffered saline (PBS). Prepared to the desired concentration.
(2) Measuring method Xanthine oxidase (derived from bovine milk, manufactured by Sigma) was adjusted to 0.02 units / mL with phosphate buffered saline (PBS), and 50 μL / well was added to a 96-well plate. Further, 50 μL / well of a test compound diluted with PBS was added. 200 μM xanthine (manufactured by Wako Pure Chemical Industries, Ltd.) prepared using PBS was added at 100 μL / well and allowed to react at room temperature for 10 minutes. Absorbance was measured under the condition of 290 nm using a microplate reader Spectramax Plus 384 (manufactured by Molecular Devices). The concentration (IC ₅₀ ) of the test compound that inhibits 50% was calculated with the absorbance under the condition where xanthine was not added as 0% and the control without the test compound as 100% (Table 17). In the table, Ex. No shows an Example number.

Test example 2
Uric acid transport inhibitory activity using human URAT1-expressing cells
(1) Preparation of human URAT1 transient expression cells Human URAT1 full-length cDNA (NCBI Accession No. NM — 144585) was subcloned into the expression vector pcDNA3.1 (manufactured by Invitrogen). Human URAT1 expression vector was introduced into COS7 cells (RIKEN CELL BANK RCB0539) using Lipofectamine 2000 (Invitrogen). COS7 cells were placed in a collagen-coated 24-well plate (Beckton Dickinson) at 3 × 10 ⁵ cells / well using 10% fetal bovine serum (Sanko Junyaku Co.)-Containing D-MEM medium (Invitrogen) 2 Culturing was performed at 37 ° C. for 5 hours under 5% CO ₂ conditions. 2 μL of Lipofectamine 2000 per well was diluted with 50 μL of OPTI-MEM (manufactured by Invitrogen) and allowed to stand at room temperature for 7 minutes (hereinafter referred to as Lipo2000-OPTI). 0.8 μg human URAT1 expression vector per well is diluted with 50 μL of OPTI-MEM (manufactured by Invitrogen), mixed gently with Lipo2000-OPTI, allowed to stand at room temperature for 25 minutes, and then 100 μL per well. Added to COS7 cells. Furthermore, COS7 cells were cultured for 2 days under conditions of 37 ° C. and 5% CO ₂ and subjected to measurement of uptake inhibition activity.

(2) Preparation of test compound The test compound was dissolved in DMSO (manufactured by Wako Pure Chemical Industries, Ltd.) to a concentration of 10 mM, and then a pretreatment buffer (125 mM sodium gluconate, 4.8 mM potassium gluconate, 1 .2 mM potassium dihydrogen phosphate, 1.2 mM magnesium sulfate, 1.3 mM calcium gluconate, 5.6 mM glucose, 25 mM hepes, pH 7.4) did. A pretreatment buffer containing no test compound was used as a control. Further, an equal amount of pretreatment buffer containing ¹⁴ C-labeled uric acid (American Radiolabeled Chemicals) was added to the test compound and the control to finally produce an assay buffer containing 20 μM uric acid.

(3) Measurement method All tests were performed on a hot plate at 37 ° C. Pretreatment buffer and assay buffer were used after warming at 37 ° C. The medium was removed from the plate and 700 μL of pretreatment buffer was added and preincubated for 10 minutes. After repeating the same operation, the pretreatment buffer was removed, assay buffer was added at 400 μL / well, and an uptake reaction was performed for 5 minutes. Immediately after the reaction was completed, the assay buffer was removed, and iced pretreatment buffer was added at 1.2 mL / well, and the cells were washed twice. 0.2N sodium hydroxide was added at 300 μL / well to lyse the cells. Transfer the cell lysate to a picoplate (Perkin Elmer), add Microcinti 40 (Perkin Elmer) at 600 μL / well, mix, and then use a liquid scintillation counter (Perkin Elmer) to perform radioactivity. It was measured. Further, COS7 cells into which no URAT1 expression vector was introduced were also measured for radioactivity under the same conditions as in the control. As a result, the compounds of Examples 5, 8, 17, 18, 22, 40, and 55 showed an inhibitory activity of 50% or more at a compound concentration of 10 μM.

Test example 3
Serum uric acid lowering action Male test CD (SD) IGS rats (5-week-old, Charles River, Japan) were forcibly orally administered to male CD (SD) IGS rats fasted overnight with 1 mg / kg of a test compound suspended in a 0.5% methylcellulose aqueous solution. Two hours after administration, blood was collected from the abdominal aorta under ether anesthesia, and serum was separated according to a conventional method. The serum uric acid level was measured using a uric acid measurement kit (uric acid C-Test Wako: Wako Pure Chemical Industries), and the uric acid reduction rate was calculated by the following formula. As a result, the compounds of Examples 2, 7, 10, 22, 23, 25, 37, 49, 50, and 58 showed a uric acid reduction rate of 60% or more.
Uric acid reduction rate (%) = (serum uric acid level of control animal−serum uric acid level of test compound-administered animal) × 100 / serum uric acid level of control animal

  Since the indolizine derivative represented by the formula (I) of the present invention or a prodrug thereof, or a pharmacologically acceptable salt thereof has an excellent xanthine oxidase inhibitory action, it exhibits a uric acid production inhibitory action, and serum uric acid The value can be lowered. Therefore, the present invention can provide a preventive or therapeutic agent for hyperuricemia, gouty nodule, gout arthritis, renal disorder due to hyperuricemia, urolithiasis, and the like.

Claims (18)

Formula (I)

[Where,
Ring U is phenyl or a 5- or 6-membered aromatic heterocyclic group containing 1 to 4 identical or different hetero atoms selected from an oxygen atom, a sulfur atom and a nitrogen atom in the ring;
R ¹ is C _1-6 alkyl _optionally substituted with a halogen atom, a hydroxyl group, a nitro, amino or fluorine atom;
R ² is the following (1) to (7):
(1) a halogen atom;
(2) hydroxyl group;
(3) amino;
(4) Carbamoyl;
(5) Cyano;
(6) Carboxy;
(7) The following groups each optionally having an arbitrary group selected from substituent group α: C _1-6 alkyl, C _2-6 alkenyl, C _2-6 alkynyl, C _1-6 alkoxy, Mono (di) C _1-6 alkylamino, C _2-7 acyl, C _2-7 acylamino, mono (di) C _1-6 alkylcarbamoyl, C _1-6 alkylsulfonyl, C _1-6 alkylsulfonylamino, mono (Di) C _1-6 alkylsulfamoyl, C _1-6 alkylthio, C _2-6 alkenyl C _1-6 alkoxy, C _3-8 cycloalkyl, 3-8 membered heterocycloalkyl, C _5-8 cyclo alkenyl, 5-8 membered _{heterocycloalkenyl, C 3-8 cycloalkyloxy, C 3-8 cycloalkylamino, C 3-8} cycloalkyl _{C 1-6 alkyl, C 3-8} A cycloalkyl _{C 1-6 alkoxy, C 3-8 cycloalkyl-C 1-6} alkylamino, aryl, heteroaryl, aryloxy, arylamino, arylcarbonyl, arylcarbonylamino, aryl _{C 1-6} alkoxy, heteroaryloxy, Heteroarylamino, heteroarylcarbonyl or heteroarylcarbonylamino;
One of the following:
m is an integer of 0 to 2 (provided that when m is 2, these R ^{1 s} may be different from each other);
n is an integer from 0 to 3 (provided that when n is 2 or 3, these R ^{2 s} may be different from each other; in addition, two R ² are bonded to adjacent atoms in the indolizine ring. there was, and, independently, optionally be substituted with a fluorine atom substituted at C _1-6 alkyl and fluorine atom are groups also selected from a C _1-6 alkoxy And may form a 5- to 8-membered ring with the atoms in the indolizine ring to which two R ² are bonded.);
R ³ is a hydrogen atom, a chlorine atom or a fluorine atom;
The substituent group α is a fluorine atom, a chlorine atom, a hydroxyl group, amino, carboxy, carbamoyl, cyano, C _1-6 alkyl, C _1-6 alkoxy, and mono (di) C _1-6 alkylamino; Or a prodrug thereof, or a pharmacologically acceptable salt thereof ;
Here, the prodrug is a compound represented by the formula (I), wherein one or more arbitrary hydroxyl groups or amino groups are bonded to C _1-6 alkyl-CO—, aryl-CO—, C _1-6 alkyl-O. -C _1-6 alkylene _{-CO-, C 1-6} alkyl _{--OCO-C 1-6} alkylene _{-CO-, C 1-6} alkyl _{-OCO-, C 1-6} alkyl _{-O-C 1-6} alkylene - _{OCO-, C 1-6} alkyl _{-COO-C 1-6 alkylene, C 1-6} alkyl _{-OCOO-C 1-6} alkylene and _{C 3-8} group selected from cycloalkyl _{-OCOO-C 1-6} alkylene the compounds or one or more optional carboxy group _{having, C 1-6 alkyl, C 1-6} alkyl _{-COO-C 1-6 alkylene, C 1-6} alkyl _{-OCOO-C 1-6} alkylene, _{C 3 8} cycloalkyl _{-OCOO-C 1-6} alkylene, mono- (di) hydroxy _{C 1-6} alkyl, mono (di) hydroxy _{C 1-6} alkyl _{-OCOO-C 1-6 alkylene, C 1-6} alkoxy _{C 1- 6} alkoxy C _1-6 alkyl, mono (di) C _1-6 alkylamino C _1-6 alkyl, 3-8 membered heterocycloalkyl C _1-6 alkyl and C _1-6 alkyl-OCO-amino C _1- A compound having a group selected from ₆ alkylene . Formula (Ia)

[Where,
Ring U is phenyl or a 5- or 6-membered aromatic heterocyclic group containing 1 to 4 identical or different hetero atoms selected from an oxygen atom, a sulfur atom and a nitrogen atom in the ring ;
R ^1a represents a hydrogen atom, a fluorine atom, a hydroxyl group, amino, methyl or trifluoromethyl;
R ^2a and R ^2b are each independently the following (a1) to (a4):
(A1) a hydrogen atom;
(A2) a halogen atom;
(A3) hydroxyl group;
(A4) The following groups optionally having any group selected from substituent group α: C _1-6 alkyl, C _1-6 alkoxy, mono (di) C _1-6 alkylamino, C _2-7 acyl, C _1-6 alkylthio, C _3-8 cycloalkyl, 3-8 membered heterocycloalkyl, aryl or heteroaryl;
R ^2c has a hydrogen atom, a halogen atom, a hydroxyl group, C _1-6 alkyl optionally having an arbitrary group selected from substituent group α, or an arbitrary group selected from substituent group α which may be _{C 1-6} alkoxy; or where R ^2a and R ^2b or R ^2b and R ^2c, are each independently, _{C 1-6} alkyl optionally substituted by a fluorine atom and a fluorine atom In the case of a group selected from C _1-6 alkoxy which may be substituted, a 5- to 8-membered ring may be formed together with the atoms in the indolizine ring to which it is bonded. );
R ^2d is a hydrogen atom or a fluorine atom;
R ^3a represents a hydrogen atom or a fluorine atom;
Substituent group α has the same meaning as in claim 1. Or an pharmacologically acceptable salt thereof, or an indolizine derivative according to claim 1 or a prodrug thereof ;
Here, the prodrug is a compound represented by the formula (Ia), wherein one or more arbitrary hydroxyl groups or amino groups are bonded to C _1-6 alkyl-CO—, aryl-CO—, C _1-6 alkyl-O. -C _1-6 alkylene _{-CO-, C 1-6} alkyl _{--OCO-C 1-6} alkylene _{-CO-, C 1-6} alkyl _{-OCO-, C 1-6} alkyl _{-O-C 1-6} alkylene - _{OCO-, C 1-6} alkyl _{-COO-C 1-6 alkylene, C 1-6} alkyl _{-OCOO-C 1-6} alkylene and _{C 3-8} group selected from cycloalkyl _{-OCOO-C 1-6} alkylene the compounds or one or more optional carboxy group _{having, C 1-6 alkyl, C 1-6} alkyl _{-COO-C 1-6 alkylene, C 1-6} alkyl _{-OCOO-C 1-6} alkylene, C _-8 cycloalkyl _{-OCOO-C 1-6} alkylene, mono- (di) hydroxy _{C 1-6} alkyl, mono (di) hydroxy _{C 1-6} alkyl _{-OCOO-C 1-6 alkylene, C 1-6} alkoxy _{C 1 -6} alkoxy C _1-6 alkyl, mono (di) C _1-6 alkylamino C _1-6 alkyl, 3-8 membered heterocycloalkyl C _1-6 alkyl and C _1-6 alkyl-OCO-amino C ₁ A compound having a group selected from _-6 alkylene . The indolizine derivative or a prodrug thereof or a pharmacologically acceptable salt thereof according to claim 2, wherein the ring U is a benzene, pyridine, thiophene or thiazole ring. formula

Is a group represented by the formula

The indolizine derivative or a prodrug thereof, or a pharmacologically acceptable salt thereof according to claim 2, wherein R ^1a is a hydrogen atom or a hydroxyl group. R ^2a and R ^2b are each independently the following (b1) to (b4):
(B1) a hydrogen atom;
(B2) a halogen atom;
(B3) hydroxyl group;
(B4) Either of the following groups each optionally substituted with a fluorine atom: C _1-6 alkyl, C _1-6 alkoxy, mono (di) C _1-6 alkylamino or hydroxy C _1-6 alkyl Is;
R ^2c is a hydrogen atom, a halogen atom, a hydroxyl group, a C _1-6 alkyl which may be substituted with a fluorine atom, or a C _1-6 alkoxy which may be substituted with a fluorine atom;
The indolizine derivative or a prodrug thereof, or a pharmacologically acceptable salt thereof according to claim 3 or 4, wherein ^R2d is a hydrogen atom, The indolizine derivative in any one of Claims 2-5, its prodrug , or its pharmacologically acceptable salt. R < ^{3 >} or R ^<3a> is a hydrogen atom, The indolizine derivative in any one of Claims 1-6, its prodrug , or its pharmacologically acceptable salt. R ^1a is a hydrogen atom or a hydroxyl group;
R ^2a is a hydrogen atom, a fluorine atom, a chlorine atom, methyl, ethyl, methoxy, monofluoromethyl, difluoromethyl, trifluoromethyl, difluoromethoxy or trifluoromethoxy;
R ^2b is a hydrogen atom, a fluorine atom, a chlorine atom, methyl, ethyl, methoxy, monofluoromethyl, difluoromethyl, trifluoromethyl, difluoromethoxy or trifluoromethoxy;
^R2c is a hydrogen atom, a fluorine atom, a chlorine atom, methyl, monofluoromethyl, difluoromethyl or trifluoromethyl; The indolizine derivative or prodrug thereof according to claim 6 or 7, or a pharmacologically acceptable salt thereof. Salt. ^R2b is a hydrogen atom, methyl, ethyl, methoxy, monofluoromethyl, difluoromethyl, trifluoromethyl, difluoromethoxy or trifluoromethoxy, or an indolizine derivative or a prodrug thereof, or a pharmacologically thereof Acceptable salt. The indolizine derivative or a prodrug thereof or a pharmaceutically acceptable salt thereof according to claim 8 or 9, wherein R ^1a is a hydrogen atom. The indolizine derivative or a prodrug thereof or a pharmacologically acceptable salt thereof according to claim 8 or 9, wherein R ^1a is a hydroxyl group. 4- (1-cyanoindolizin-3-yl) benzoic acid,
4- (1-cyano-7-methylindolizin-3-yl) benzoic acid,
4- (8-chloro-1-cyanoindolizin-3-yl) benzoic acid,
4- (1-cyano-8-methylindolizin-3-yl) benzoic acid,
4- (1-cyano-6-methylindolizin-3-yl) benzoic acid,
4- (1-cyano-6,8-dimethylindolizin-3-yl) benzoic acid,
4- (1-cyano-8-fluoro-7-methylindolizin-3-yl) benzoic acid,
4- (1-cyano-6-fluoro-7-methylindolizin-3-yl) benzoic acid,
4- (1-cyano-7-ethylindolizin-3-yl) benzoic acid,
4- (1-cyano-8-ethylindolizin-3-yl) benzoic acid,
4- (1-cyano-8-fluoroindolizin-3-yl) benzoic acid,
4- (1-cyano-6-fluoroindolizin-3-yl) benzoic acid,
4- (1-cyano-7-trifluoromethylindolizin-3-yl) benzoic acid,
4- (1-cyanoindolizin-3-yl) -2-hydroxybenzoic acid,
4- (1-cyano-7-methylindolizin-3-yl) -2-hydroxybenzoic acid,
4- (1-cyano-8-methylindolizin-3-yl) -2-hydroxybenzoic acid,
4- (1-cyano-6-methylindolizin-3-yl) -2-hydroxybenzoic acid,
4- (1-cyano-6,8-dimethylindolizin-3-yl) -2-hydroxybenzoic acid,
4- (1-cyano-6-fluoro-7-methylindolizin-3-yl) -2-hydroxybenzoic acid,
4- (1-cyano-8-fluoro-7-methylindolizin-3-yl) -2-hydroxybenzoic acid,
4- (1-cyano-8-ethylindolizin-3-yl) -2-hydroxybenzoic acid,
4- (1-cyano-8-fluoroindolizin-3-yl) -2-hydroxybenzoic acid,
4- (1-cyano-6-fluoroindolizin-3-yl) -2-hydroxybenzoic acid,
4- (1-cyano-7-trifluoromethylindolizin-3-yl) -2-hydroxybenzoic acid,
4- (1-cyano-7-fluoromethylindolizin-3-yl) benzoic acid,
4- (6-chloro-1-cyano-7-methylindolizin-3-yl) benzoic acid,
4- (8-chloro-1-cyano-7-methylindolizin-3-yl) benzoic acid,
4- (1-cyano-7,8-dimethylindolizin-3-yl) benzoic acid,
4- (7-chloro-1-cyano-8-methylindolizin-3-yl) benzoic acid,
4- (1-cyano-6,8-difluoroindolizin-3-yl) benzoic acid,
4- (1-cyano-8-methoxyindolizin-3-yl) benzoic acid,
4- (1-cyano-7-methoxyindolizin-3-yl) benzoic acid,
4- (1-cyano-7-methoxy-6-methylindolizin-3-yl) benzoic acid,
4- (1-cyano-6-fluoro-7-trifluoromethylindolizin-3-yl) -2-hydroxybenzoic acid,
4- (6-chloro-1-cyano-7-methylindolizin-3-yl) -2-hydroxybenzoic acid,
4- (8-chloro-1-cyano-7-methylindolizin-3-yl) -2-hydroxybenzoic acid,
4- (1-cyano-7,8-dimethylindolizin-3-yl) -2-hydroxybenzoic acid,
4- (7-chloro-1-cyano-8-methylindolizin-3-yl) -2-hydroxybenzoic acid,
4- (1-cyano-6,8-difluoroindolizin-3-yl) -2-hydroxybenzoic acid,
4- (1-cyano-7-methoxyindolizin-3-yl) -2-hydroxybenzoic acid,
4- (1-cyano-7-methoxy-6-methylindolizin-3-yl) -2-hydroxybenzoic acid, and
The indolizine derivative or pharmacologically acceptable salt thereof according to claim 1, selected from 4- (1-cyano-7-fluoromethylindolizin-3-yl) -2-hydroxybenzoic acid. The indolizine derivative according to any one of claims 1 to 12 , which is a xanthine oxidase inhibitor, or a prodrug thereof, or a pharmacologically acceptable salt thereof. A pharmaceutical composition comprising the indolizine derivative according to any one of claims 1 to 12 or a prodrug thereof, or a pharmacologically acceptable salt thereof as an active ingredient. The pharmaceutical composition according to claim 14 , which is used for the prophylaxis or treatment of a disease selected from hyperuricemia, gouty nodule, gout arthritis, renal disorder due to hyperuricemia and urolithiasis. The pharmaceutical composition according to claim 15 , which is used for prevention or treatment of hyperuricemia. The pharmaceutical composition according to claim 14 , which is a serum uric acid level-lowering drug. The pharmaceutical composition according to claim 14, which is a uric acid production inhibitor.